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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
adjective [ADJECTIVE noun] REM sleep is a period of sleep that is very deep, during which your eyes and muscles make many small movements. It is the period during which most of your dreams occur. REM is an abbreviation for 'rapid eye movement'.